I'm not sure what receivers you are using, but if it's this one:
http://www.nvs-gnss.com/products/receivers/item/2-nv08c-csm.html it seems
to be L1 only, not L1+L2. The antenna you are using covers 1574-1610 MHz,
so while multi-system (GPS/Glonass) it is also L1 only. The GPS L2
frequency is quite a bit lower, at 1227.6 MHz.
http://en.wikipedia.org/wiki/GPS_signals#Frequencies_used_by_GPS
As far as I know, GPS L1+L2 receivers start around $750 used (eg. Trimble
4000ssi on ebay) and much more new.
On 9/17/2014 2:05 PM, Sean Hyde wrote:
NVS08C on custom PCB using the receiver to power the antenna
Antenna is Taoglas Limited AA.161.301111
(http://www.taoglas.com/images/product_images/original_images/AA.161.301111.pdf)
Antenna is on a 12” x 24” steel plate
The Rover setup is on a small mobile robot with a top speed of about 3mph.
It is in a city (Pittsburgh), but the sky is relatively unobstructed.
I’m running rtknavi in Kinematic mode using only GPS, L1+L2, 15deg elevation
mask.
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